/* SPDX-License-Identifier: WTFPL */

/* MariaDB Scheme
   Version: 1 */

/* REMARKS
   - there are by design no created_at, updated_at, updates_by or similar fields

   TODO
   - check all values if unsigned can be used or not
   - add referential actions where appropriate
   - rename provisions to provision(?)
   - review defaults
   */

/* User
   userid is signed because nevative values are required for settings
   The user table must not be writeable by the webgui user!
   */

CREATE TABLE user (
    userid smallint(6) NOT NULL AUTO_INCREMENT,
    login varchar(20) NOT NULL,
    pass binary(60) NOT NULL,
    displayname varchar(100) NOT NULL,
    role enum('vessel','captain','helmsman','sailor') NOT NULL DEFAULT 'sailor',
    flags set('deleted','locked'),
    language char(2) NOT NULL DEFAULT 'en',
    PRIMARY KEY (userid),
    UNIQUE INDEX ix_login (login)
) ENGINE=InnoDB;

/* Settings
   E.g. the currently selected boat. Users logged in via the web are allowed
   to write to this table. Therefore a separate table and not additional
   fields in the user data record.

   userid=0: Global program settings
   sno=0: db_scheme_version
   sno=1: doc_base_path

   userid = -1: description of user settings for development and admin use

   userid >=1: setings per user
   sno=1 current vessel

   */
CREATE TABLE settings (
    userid smallint(6) NOT NULL,
    sno smallint(6) NOT NULL,
    valstr varchar(200) DEFAULT NULL,
    valint int(10) DEFAULT NULL,
    PRIMARY KEY (userid, sno)
) ENGINE=InnoDB;

/* ddid=0 is list of lists, not editable
   flags: fixed=not deletable, value not changeable
          locked=not editable
   */
CREATE TABLE dropdown (
    ddid tinyint(3) UNSIGNED NOT NULL,
    ddval tinyint(3) NOT NULL,
    sort tinyint(3) DEFAULT NULL,
    ddtext varchar(50) NOT NULL,
    ddshort varchar(4) DEFAULT NULL,
    color char(6) DEFAULT NULL,
    flags enum('locked','fixed') DEFAULT NULL,
    PRIMARY KEY (ddid, ddval)
) ENGINE=InnoDB;

/* compid is signed because negative values needed for special purpose */
CREATE TABLE company (
    compid smallint(6) NOT NULL AUTO_INCREMENT,
    compname varchar(60) NOT NULL,
    comptype tinyint(3) UNSIGNED NOT NULL DEFAULT 1,
    comptype2 tinyint(3) UNSIGNED DEFAULT NULL,
    shortname varchar(20) DEFAULT NULL,
    street varchar(40),
    zip varchar(10),
    city varchar(30),
    country varchar(30),
    contact varchar(30),
    phone varchar(30),
    email varchar(50),
    web varchar(40),
    customerno varchar(20),
    contractno varchar(20),
    remarks varchar(150) DEFAULT NULL,
    flags set('deleted','historic') DEFAULT NULL,
    PRIMARY KEY (compid),
    UNIQUE INDEX ix_compname (compname, comptype)
) ENGINE=InnoDB;

CREATE TABLE vessel (
    vid smallint(6) NOT NULL AUTO_INCREMENT,
    vtype enum('mono','cat','tri') NOT NULL DEFAULT 'mono',
    vesselname varchar(40) NOT NULL,
    model varchar(20) DEFAULT NULL,
    shipyard smallint(6) DEFAULT NULL,
    year_built year DEFAULT NULL,
    loa float(4,2) UNSIGNED DEFAULT NULL,
    lwl float(4,2) UNSIGNED DEFAULT NULL,
    beam float(4,2) UNSIGNED DEFAULT NULL,
    draught float(3,2) UNSIGNED DEFAULT NULL,
    draught_min float(3,2) UNSIGNED DEFAULT NULL,
    displacement smallint(6) UNSIGNED DEFAULT NULL,
    ballast smallint(6) UNSIGNED DEFAULT NULL,
    beltpos_aft float(4,2) UNSIGNED DEFAULT NULL,
    beltpos_bow float(4,2) UNSIGNED DEFAULT NULL,
    shapefile varchar(40) DEFAULT NULL,
    sid_default smallint(6) UNSIGNED DEFAULT NULL, -- default storage
    remarks varchar(150) DEFAULT NULL,
    PRIMARY KEY (vid),
    FOREIGN KEY fk_vessel_shipyard (shipyard)
        REFERENCES company(compid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

CREATE TABLE storage (
    sid smallint(6) UNSIGNED NOT NULL AUTO_INCREMENT,
    vid smallint(6) NOT NULL DEFAULT 1,
    sname varchar(40) NOT NULL,
    stype tinyint(3) NOT NULL DEFAULT 0, -- ddid=3
    capacity smallint(6) DEFAULT NULL,
    capaunit enum('kg','l') DEFAULT NULL,
    x smallint(6) UNSIGNED NOT NULL DEFAULT 0,
    y smallint(6) NOT NULL DEFAULT 0,
    z smallint(6) NOT NULL DEFAULT 0,
    wx smallint(6) UNSIGNED NOT NULL DEFAULT 0,
    wy smallint(6) UNSIGNED NOT NULL DEFAULT 0,
    wz smallint(6) UNSIGNED NOT NULL DEFAULT 0,
    angle smallint(4) NOT NULL DEFAULT 0,
    color char(6) DEFAULT NULL,
    remarks varchar(150) DEFAULT NULL,
    PRIMARY KEY (sid),
    FOREIGN KEY fk_storage_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

/* intentionally after storage creation */
ALTER TABLE vessel
    ADD CONSTRAINT fk_vessel_storage
    FOREIGN KEY (sid_default)
        REFERENCES storage(sid)
        ON DELETE RESTRICT;

CREATE TABLE tag (
    tagid smallint(6) UNSIGNED NOT NULL AUTO_INCREMENT,
    tagname varchar(20) NOT NULL,
    color char(6) DEFAULT NULL,
    description varchar(80) DEFAULT NULL,
    PRIMARY KEY (tagid),
    UNIQUE INDEX ix_tagname (tagname)
) ENGINE=InnoDB;

CREATE TABLE tagref (
    tagid smallint(6) UNSIGNED NOT NULL,
    objid int(10) UNSIGNED NOT NULL,
    objtype enum('equip','inv','prov','doc', 'proj', 'task', 'maint') NOT NULL,
    PRIMARY KEY (tagid, objid, objtype),
    INDEX ix_tagref_obj (objid, objtype),
    FOREIGN KEY fk_tagref_tag (tagid)
        REFERENCES tag(tagid)
        ON DELETE CASCADE
) ENGINE=InnoDB;

/* TODO Boxes can be nested via parent,
        very low priority because perhaps rarely used  */
CREATE TABLE box (
    boxid smallint(6) UNSIGNED NOT NULL AUTO_INCREMENT,
    sid smallint(6) UNSIGNED NOT NULL,
    boxtype tinyint(3) DEFAULT NULL,
    parent smallint(6) UNSIGNED DEFAULT NULL,
    label varchar(20) DEFAULT NULL,
    color char(6) DEFAULT NULL,
    content varchar(60) DEFAULT NULL,
    weight float(5,2) UNSIGNED DEFAULT NULL,
    wx smallint(6) UNSIGNED NOT NULL DEFAULT 0,
    wy smallint(6) UNSIGNED NOT NULL DEFAULT 0,
    wz smallint(6) UNSIGNED NOT NULL DEFAULT 0,
    remarks varchar(150) DEFAULT NULL,
    PRIMARY KEY (boxid),
    INDEX ix_label (label),
    FOREIGN KEY fk_box_storage (sid)
        REFERENCES storage(sid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_box_parent (parent)
        REFERENCES box(boxid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

CREATE TABLE equipment (
    eid smallint(6) UNSIGNED NOT NULL AUTO_INCREMENT,
    vid smallint(6) NOT NULL DEFAULT 1,
    ename varchar(80) NOT NULL,
    shortname varchar(20) DEFAULT NULL,
    model varchar(40) DEFAULT NULL,
    ecat tinyint(3) DEFAULT NULL,
    serial varchar(30) DEFAULT NULL,
    supplier smallint(6) DEFAULT NULL,
    manufacturer smallint(6) DEFAULT NULL, -- -1: unknown; -3: own built
    purchdate date DEFAULT NULL,
    price decimal(12,2) DEFAULT NULL,
    weight float(5,2) UNSIGNED DEFAULT NULL,
    remarks varchar(150) DEFAULT NULL,
    flags set('ordered','removed','deleted') DEFAULT NULL,
    PRIMARY KEY(eid),
    FOREIGN KEY fk_equipment_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_equipment_supplier (supplier)
        REFERENCES company(compid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_equipment_manufacturer (manufacturer)
        REFERENCES company(compid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

CREATE TABLE inventory (
    invid int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
    invname varchar(80) NOT NULL,
    conttype enum('storage','box') NOT NULL DEFAULT 'storage',
    sid smallint(6) UNSIGNED DEFAULT NULL,
    boxid smallint(6) UNSIGNED DEFAULT NULL,
    eid smallint(6) UNSIGNED DEFAULT NULL, -- spare part reference to equipment
    number smallint(6) UNSIGNED NOT NULL DEFAULT 1,
    weight float(5,2) UNSIGNED DEFAULT NULL,
    price decimal(12,2) DEFAULT NULL,
    purchdate date DEFAULT NULL,
    invcond enum('unknown','excellent','good','fair','bad','repairable','defect') NOT NULL default 'unknown',
    remarks varchar(150) DEFAULT NULL,
    flags set('ordered','removed','deleted') DEFAULT NULL,
    PRIMARY KEY (invid),
    INDEX ix_invname (invname),
    FOREIGN KEY fk_inventory_storage (sid)
        REFERENCES storage(sid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_inventory_box (boxid)
        REFERENCES box(boxid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_inventory_equipment (eid)
        REFERENCES equipment(eid)
        ON DELETE RESTRICT,
    CHECK (
        (sid IS NOT NULL AND boxid IS NULL)
        OR
        (sid IS NULL AND boxid IS NOT NULL)
    )
) ENGINE=InnoDB;

CREATE TABLE cable (
    cableid smallint(6) UNSIGNED NOT NULL AUTO_INCREMENT,
    vid smallint(6) NOT NULL DEFAULT 1,
    cablename varchar(80) NOT NULL,
    cabletype tinyint(3) DEFAULT NULL, -- from dropdown id 11 e.g. antenna cable
    techname tinyint(3) DEFAULT NULL, -- from dropdown id 12  e.g. H07RN-F
    length float(5,2) UNSIGNED NOT NULL DEFAULT 0, -- total length in m
    conductors tinyint(3) UNSIGNED NOT NULL DEFAULT 1,
    diameter float(5,2) UNSIGNED DEFAULT NULL, -- outer diameter in mm
    xsection float(5,2) UNSIGNED DEFAULT NULL, -- cross section in mm²
    weight float(5,2) UNSIGNED DEFAULT NULL, -- kg/meter
    color char(6) DEFAULT NULL,
    supplier smallint(6) DEFAULT NULL,
    manufacturer smallint(6) DEFAULT NULL,
    cablecond enum('unknown','new','excellent','good','fair','bad','repairable','defect') NOT NULL default 'unknown',
    remarks varchar(150) DEFAULT NULL,
    PRIMARY KEY (cableid),
    INDEX ix_cablename (vid, cablename),
    FOREIGN KEY fk_cable_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_cable_supplier (supplier)
        REFERENCES company(compid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_cable_manufacturer (manufacturer)
        REFERENCES company(compid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

CREATE table fuse (
    fuseid smallint(6) UNSIGNED NOT NULL AUTO_INCREMENT,
    vid smallint(6) NOT NULL DEFAULT 1,
    fnumber smallint(6) NOT NULL,
    ftype tinyint(3) DEFAULT 0, -- from dropdown id 7
    current float(5,2) UNSIGNED NOT NULL, -- in A
    cableid smallint(6) UNSIGNED DEFAULT NULL,
    eid smallint(6) UNSIGNED DEFAULT NULL,
    location tinyint(3) DEFAULT 0, -- from dropdown id 10
    description varchar(60) DEFAULT NULL,
    remarks varchar(150) DEFAULT NULL,
    PRIMARY KEY (fuseid),
    UNIQUE INDEX ix_fusenumber (vid, fnumber),
    FOREIGN KEY fk_fuse_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_fuse_cable (cableid)
        REFERENCES cable(cableid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_fuse_equipment (eid)
        REFERENCES equipment(eid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

-- change vals to decimal(12,4)?
CREATE TABLE measurement (
    mid smallint(6) NOT NULL AUTO_INCREMENT,
    mname varchar(80) NOT NULL,
    vid smallint(6) NOT NULL DEFAULT 1,
    eid smallint(6) UNSIGNED DEFAULT NULL,
    nval tinyint(1) UNSIGNED NOT NULL DEFAULT 1,
    val1 int(10) NOT NULL,
    val2 int(10) DEFAULT NULL,
    val3 int(10) DEFAULT NULL,
    unit tinyint(3) NOT NULL DEFAULT 1,
    accuracy enum('unknown','precise','normal','rough','estimated') NOT NULL DEFAULT 'unknown',
    mdate date DEFAULT NULL,
    note varchar(80) DEFAULT NULL,
    PRIMARY KEY (mid),
    FOREIGN KEY fk_measurement_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_measurement_equipment (eid)
        REFERENCES equipment(eid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

CREATE TABLE provisions (
    provid int(10) NOT NULL AUTO_INCREMENT,
    provname varchar(40) NOT NULL,
    provcat tinyint(3) DEFAULT NULL,
    sid smallint(6) UNSIGNED DEFAULT NULL,
    boxid smallint(6) UNSIGNED NOT NULL DEFAULT 1,
    number smallint(6) UNSIGNED NOT NULL DEFAULT 1,
    target smallint(6) UNSIGNED DEFAULT NULL, -- for shopping list
    weight float(5,2) UNSIGNED DEFAULT NULL,
    weight_net float(5,2) UNSIGNED DEFAULT NULL,
    unit tinyint(3) DEFAULT NULL,
    calories smallint(6) UNSIGNED DEFAULT NULL,
    storedate date DEFAULT CURRENT_DATE,
    shelflife date DEFAULT NULL,
    price decimal(12,2) DEFAULT NULL,
    remarks varchar(150) DEFAULT NULL,
    PRIMARY KEY (provid),
    FOREIGN KEY fk_provisions_storage (sid)
        REFERENCES storage(sid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_provisions_box (boxid)
        REFERENCES box(boxid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

/* TODO
     - distinction between
        docdate - e.g. invoicedate
        doctime -> uploadtime
*/
CREATE TABLE document (
    docid smallint(6) NOT NULL AUTO_INCREMENT,
    doctype enum('generic','manual','invoice','drawing','picture') NOT NULL DEFAULT 'generic',
    mimetype varchar(80) NOT NULL DEFAULT 'application/octet-stream',
    filename varchar(200) NOT NULL,
    extension char(3) NOT NULL,
    hash varchar(32) NOT NULL,
    docsize int(10) unsigned NOT NULL,
    doctime datetime DEFAULT NULL,
    docdate date DEFAULT NULL, -- e.g. invoice date
    title varchar(40) DEFAULT NULL,
    pages smallint(6) unsigned NOT NULL DEFAULT 1,
    remarks varchar(150) DEFAULT NULL,
    roleaccess enum('captain','helmsman','sailor','unauth') NOT NULL DEFAULT 'captain',
    PRIMARY KEY (docid),
    UNIQUE INDEX ix_hash (hash)
) ENGINE=InnoDB;

CREATE TABLE docref (
    drid int(10) NOT NULL AUTO_INCREMENT,
    reftype enum('vessel','box','equipment','project','maint', 'task','user','company') NOT NULL DEFAULT 'vessel',
    docid smallint(6) NOT NULL,
    refid int(10) NOT NULL,
    PRIMARY KEY (drid),
    UNIQUE INDEX ix_docref (docid, refid, reftype),
    INDEX ix_docref_ref (refid, reftype),
    FOREIGN KEY fk_docref_doc (docid)
        REFERENCES document (docid)
        ON DELETE CASCADE
) ENGINE=InnoDB;

/* TODO optional fields: target date?
   responsible?
   signalk: operating hours current vs maint every n operating hours in separate 
*/
CREATE TABLE maintenance (
    maintid int(10) NOT NULL AUTO_INCREMENT,
    vid smallint(6) NOT NULL DEFAULT 1,
    eid smallint(6) UNSIGNED DEFAULT NULL,
    series smallint(6) DEFAULT NULL,
    activities varchar(40) NOT NULL,
    plan_date DATE DEFAULT NULL,
    completion_date DATE DEFAULT NULL,
    interval_hours smallint(6) DEFAULT NULL,
    last_hours int(10) DEFAULT NULL,
    remarks varchar(150) DEFAULT NULL,
    maintstate enum('new','plan','ongoing','done') NOT NULL DEFAULT 'new',
    PRIMARY KEY (maintid),
    FOREIGN KEY fk_maintenance_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_maintenance_equipment (eid)
        REFERENCES equipment(eid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

/* TODO time recording? */
CREATE TABLE project (
    projid smallint(6) NOT NULL AUTO_INCREMENT,
    projname varchar(40) NOT NULL,
    vid smallint(6) NOT NULL DEFAULT 1,
    responsible smallint(6) NOT NULL,
    startdate date DEFAULT NULL,
    duration smallint(6) UNSIGNED DEFAULT NULL,
    costs_plan decimal(12,2) DEFAULT NULL,
    costs_final decimal(12,2) DEFAULT NULL,
    remarks varchar(150) DEFAULT NULL,
    projstate enum('new','plan','ongoing','paused','finished') NOT NULL DEFAULT 'new',
    PRIMARY KEY (projid),
    FOREIGN KEY fk_project_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_project_user (responsible)
        REFERENCES user(userid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

/* TODO  executed_by : company or user? or both? */
CREATE TABLE task (
    taskid int(10) NOT NULL AUTO_INCREMENT,
    vid smallint(6) DEFAULT NULL,
    projid smallint(6) DEFAULT NULL,
    taskname varchar(60) NOT NULL,
    priority enum('high','medium','low') DEFAULT NULL,
    taskstate enum('pending','active','waiting','deleted','completed') NOT NULL DEFAULT 'pending',
    state_ts timestamp DEFAULT NULL,
    plandate date DEFAULT NULL,
    duedate date DEFAULT NULL,
    started datetime DEFAULT NULL,
    finished datetime DEFAULT NULL,
    responsible smallint(6) NOT NULL,
    remarks varchar(150) DEFAULT NULL,
    PRIMARY KEY (taskid),
    FOREIGN KEY fk_task_user (responsible)
        REFERENCES user(userid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_task_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT,
    FOREIGN KEY fk_task_project (projid)
        REFERENCES project(projid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

/* Notes can be assigned to tasks, maintenances and equipment */
CREATE TABLE note (
    noteid int(10) NOT NULL AUTO_INCREMENT,
    notetype enum('task','maint','equip') NOT NULL DEFAULT 'task',
    refid int(10) NOT NULL,
    annotation text NOT NULL,
    created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
    created_by smallint(6) DEFAULT NULL,
    PRIMARY KEY (noteid)
    FOREIGN KEY fk_note_user (created_by)
        REFERENCES user(userid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

CREATE TABLE checklist (
    clid smallint(6) NOT NULL AUTO_INCREMENT,
    title varchar(30) NOT NULL,
    parent smallint(6) DEFAULT NULL,
    clstate enum('new','open','closed') NOT NULL DEFAULT 'new',
    PRIMARY KEY (clid),
    FOREIGN KEY fk_checklist_parent (parent)
       REFERENCES checklist(clid)
       ON DELETE RESTRICT
) ENGINE=InnoDB;

CREATE TABLE checkgroup (
    groupid smallint(6) UNSIGNED NOT NULL,
    title varchar(30) NOT NULL,
    PRIMARY KEY (groupid)
) ENGINE=InnoDB;

CREATE TABLE checkitem (
    checkid int(10) NOT NULL AUTO_INCREMENT,
    checkname varchar(60) NOT NULL,
    groupid smallint(6) UNSIGNED DEFAULT NULL,
    checkresult enum('unchecked','checked','unused') NOT NULL DEFAULT 'unused',
    PRIMARY KEY (checkid),
    FOREIGN KEY fk_checkitem_group (groupid)
        REFERENCES checkgroup(groupid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

CREATE TABLE checkref (
    clid smallint(6) NOT NULL,
    checkid int(10) NOT NULL,
    sort smallint(6) DEFAULT NULL,
    PRIMARY KEY (clid, checkid),
    FOREIGN KEY fk_checkref_checklist (clid)
        REFERENCES checklist(clid)
        ON DELETE CASCADE,
    FOREIGN KEY fk_checkref_checkitem (checkid)
        REFERENCES checkitem(checkid)
        ON DELETE CASCADE
) ENGINE=InnoDB;

/* Expansion for future use: signalk mapping (just an idea) */
CREATE TABLE signalk (
    skid int(10) NOT NULL AUTO_INCREMENT,
    vid smallint(6) NOT NULL,
    objtype enum('equipment','storage') NOT NULL,
    objid int(10) NOT NULL,
    datatype enum('engine_hours','tank_level') NOT NULL,
    skpath varchar(255) NOT NULL,
    PRIMARY KEY (skid),
    UNIQUE KEY ix_signalk
        (vid, objtype, objid, datatype),
    FOREIGN KEY fk_signalk_vessel (vid)
        REFERENCES vessel(vid)
        ON DELETE RESTRICT
) ENGINE=InnoDB;

/* Token
   - Python: secrets.token_hex(8)
   - PHP: bin2hex(random_bytes(8)) */
CREATE TABLE recordlock (
    lock_table varchar(40) NOT NULL,
    lock_key int(10) NOT NULL,
    token varchar(16) NOT NULL,
    userid smallint(6) NOT NULL,
    created_at timestamp NOT NULL DEFAULT current_timestamp,
    last_seen timestamp NOT NULL DEFAULT current_timestamp,
    PRIMARY KEY (lock_table, lock_key),
    UNIQUE KEY ix_lock_token (token)
) ENGINE=MEMORY;

/* Use with: UPDATE revision SET changed=CURRENT_TIMESTAMP WHERE revid=? */
CREATE TABLE revision (
   revid smallint(6) UNSIGNED NOT NULL,
   changed timestamp NOT NULL,
   PRIMARY KEY (revid),
   INDEX ix_revision_ts (changed) -- for select by timestamp
) ENGINE=MEMORY;